Nondestructive testing (NDT) techniques are useful tools for analyzing reinforced concrete structures. The use of ultrasonic
pulse velocity (UPV) measurements enables the monitoring of changes in some critical characteristics of concrete over the
service life of a structure. The interpretation of the data collected allows an assessment of concrete uniformity, and can be
used to perform quality control, to monitor deterioration and even, by means of comparison against reference samples, to
estimate compressive strength. Nonetheless, the current techniques for UPV data analysis are, on a large degree, based on
the sensitivity of the professionals who apply these tests. For accurate diagnosis it is necessary to consider the various factors
and conditions that can affect the results. To proper control and inspect RC facilities it is essential to develop appropriate
strategies to make the task of data interpretation easier and more accurate. This work is based on the notion that using
Artificial Neural Networks (ANN) is a feasible way to generate workable estimation models correlating concrete characteristics,
compacity and compressive strength. The goal is to determine if it is possible to establish models based on non-linear
relationships that are capable of estimating with good accuracy the concrete strength based on previous knowledge of some
basic material characteristics and UPV measurements. The study shows that this goal is achievable and indicates that neural
models perform better than traditional statistical models. For the data collected in this work, provided by various researchers,
traditional regression models cannot exceed R² = 0.40, while the use of ANNs allows the creation of models that can
reach a determination coefficient R² = 0.90. The results make clear that, besides contributing to better the analysis of situations
where there is doubts regarding concrete strength or uniformity, neural models are an efficient way to order and transfer
unstructured knowledge. It was shown that, given the learning capacity and its ability to generalize acquired information into
mathematical patterns, ANNs are a quick and adequate way to model complex phenomena.